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/**
* @file
*
* @brief Get the Value of a Semaphore
* @ingroup POSIX_SEMAPHORE
*/
/*
* COPYRIGHT (c) 1989-2014.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <semaphore.h>
#include <rtems/posix/semaphoreimpl.h>
int sem_getvalue(
sem_t *__restrict sem,
int *__restrict sval
)
{
POSIX_Semaphore_Control *the_semaphore;
Thread_queue_Context queue_context;
the_semaphore = _POSIX_Semaphore_Get( sem, &queue_context );
if ( the_semaphore == NULL ) {
rtems_set_errno_and_return_minus_one( EINVAL );
}
_CORE_semaphore_Acquire_critical(
&the_semaphore->Semaphore,
&queue_context
);
*sval = _CORE_semaphore_Get_count( &the_semaphore->Semaphore );
_CORE_semaphore_Release( &the_semaphore->Semaphore, &queue_context );
return 0;
}
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